1. Postdoctoral Scholar, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697 (corresponding author).
2. Postdoctoral Scholar, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697.
3. Distinguished Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697.